The product is developed and produced by Antias, and the magnetron ceramic is a metallized ceramic insulation ring used for magnetrons. The white porcelain body is equipped with a through hole in the center. The metallization slurry of the upper and lower metallization layers has fine particle size, good flatness and consistency, which enhances the close combination of the metallization layer and the ceramic layer, can effectively prevent the microwave leakage generated during the operation of the magnetron, and enhance the service life of the magnetron